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L ti_' - r 'yt� � l:�.r` a4�p.� f���e�.(r �,. <br /> ;x�.rr.�,� ����'.r'k.5. si y{i.r{�' a�"_',�� '�y` � . . . ,_'v"';Jk�,t,to�i".u.,�s4 F�€21� ty*�' <br /> , Ps� <br /> +q:z` ,� t�5'�?',� � '�1,:� � � � ti <br /> '�'�' '� _������"� � � -� � � �`. <br /> 4 U <br /> '`` 'y��� �� . . . <br /> *c� � •���1, y n .'��� <br /> s. � <br /> �Y^ � '=a ��'� <br /> �� � ,� <br /> �: � � ,; ,��r �� -;. �w� �. wa�3a� �F� �' r � <br /> =�� � �,���,� �� 1595 Bohn's Point Road ;i�� :, f <br /> �. • <br /> p�; -�.��� �� Wayzata, MN 55391 I�.< _ __._�._ __.__,, , �.�,, <br /> � � <br /> �k. _����`��� �� �,,��''� ���i - i � �,,. <br /> �������� � .� <br /> � F �.�`���;p<� � ��:::� zdt�y i 3, 1989 ��� <br /> w k �4�t �°�S�„1 `C44"�m iil` . . <br /> ii)a�u�'''°F* '�'`$��'���.�tk �$t§ �' :.r+�'r''- . ���q� <br /> �. �" <br /> d"`�3�F�k��,���i``���1�c � 4 9a . . <br /> �'p;� +„ �„>� �Ra�,r z s�e� A6�S. IC8II[1C �3bUSI�1 ���"-'��' `�•' <br /> ��a�:�� ��isY������"`�`� i��, City of Orono ��','�. <br /> z;, ,� <br /> ��# �' �� �;,�.���,��, ��.,; <br /> �' ��� � � ,� Re: Our mceting of May I1, 1989 concernang the culven elevati^�. <br /> .� �f 3 f 9i•� f <br /> .2. �'f����a"�y+�'.��"�*�t'���r. - . ... <br /> a�r r���r�F �$a"�C�� ,� �:. <br /> x ' .+`.4 Y �C 'Y � k,'�S �� . . <br /> ��� ������ �3 .. .. ' �� <br /> �x -��S�s d t�- �, ;�����{��� Dcar Pv4s. Ivlabusth: <br /> �����a�������� �� ���oM���� <br /> ��ir; <br /> �� �_ ,� . �►s a resuit of our meetin at the <br /> � �� r, S pond on Bohn's Point Road on Msy I1, <br /> ��� � � � � 1989, I woutd likc to summarize our position and proposal regard;mg the <br /> '��`�.���>����;����'��: . wae�rshed flow and the elevation of the l2 inch culvert underneam� the <br /> �``'��'�' ` �` ' E �' r�ad• On A�ia 1 (pond side) of the cuivert was 929.12 <br /> �,�, � �,,,,,� 3 •'�� a,;� Y 0, 1989 the west end <br /> ����� '��.;�r�w �.,� t �,.� �d the east end (dCovacevich side) dvas 929.44, goin g i n t o t h e w a€�,r s 6 e d 1 h <br /> �`;� ' ' Yd �f� � �, drainage sw a le leadin� to Lake Minnetonka. T he survey of elevati�r�s was � ''' ° <br /> ,r"�.�r Y�? ,_ N �� ` , �� done by Cof4in & Gronberg. Prior to Mr. Kovacevich raising the c�a��re�t in <br /> ������.�, t rS � � h� �a _ ch� fall of 1987, thr elevations were West 928.6 and east - 928.0. <br /> a�G��.��`��`�.����%���g � Po <br /> ; ,, IZ decidin our sition in tfi�e sumrr.er of 1987 on how much to ra3s�e the <br /> �z rq�"�'`��rr � , �� a,�� culvert, we had a topographical surve of our ro rt <br /> � y P Pe Y PrePared. '�'i�is <br /> �;"�` s�* ,�`�t� ����wh��' included location of the major trees, as we were particularly conce�ed , �t <br /> � <br /> ����" �,p:� `��� ;� �"��� � about the large willows around the pond. �This was the sarve <br /> y you �nd <br /> F', �,i�, , , ��, Jobn Ger6ardson saw at 'our meeting. After lengthy discussion and <br /> :,r�' <br /> `�"r�;!,�,,�a; r �� AY " a 2�*` anadysis, it �v�s decided with Dale Gustafson that the maximum we,: i nvert <br /> , � ' ��""'�-'r'�'��ar"��ar����p elevation should be 930.0 fcet with slope west to east. This was '� <br /> �y�� �� � ��������������� � . . . <br /> a ����,��,�� � � �,_� , . i�corporated into Orono s letter to F!'r. Kovacevich dated November �', <br /> � <br /> ��'� � ,, � 1987, which required slope of one- larter inch per foot of culvert. � � <br /> ��'���"���{�..���N ` �� : 9. <br /> # � <br /> 'ryt�� "�}''��r�� '� In arriving at the west maximum elevation of 930.0, the following wtre ` � <br /> > r , <br /> Y <br /> �'��A f �'�`` ; ' �.,w� the key factors: -° <br /> a,�. <�r�� � <br /> 'S ��i� Y+� a;�;� <br /> � <br /> ;f ¢ �,.:;.� �r`; �.� . � 1. Several large willows are at 930.0, as you have seen. To g��ce; che <br /> ` � '� .� `t " west invert higher than 930.0 would mean the roots would be total9� <br /> t � � ` ,��"� ,,� suberaerged an unacceptable paat of the time, which would kill them. �:, <br /> �,��:� ��'`���`����� <br /> � <br /> �� ,��;,�,�",�� � � 2• Raising the evest invert above 930.0 would materially teda�e tho '' <br /> �����.,�C�,��d�.�.���� '°, "Possc�ic��" or overflow eapacity of the watershed area. Due to the veay <br /> � <br /> 1�' ��x t�,r;��,���,��� �;rad�a�9 sDope oY' the pond's b�nks, � cQ�siderably larger area would �fsen � <br /> /'� rx�.;,�;� . <br /> r��� ti ��`* i � <br /> v��+;�`�3<� ��;; �+"�- � � <br /> 7 �'� <� ,yai ,y ei�t,,�.� , � .. . <br /> �+ r a <br /> r a,�i rrt_.�i a�.�`�'� . . .�.���. �i <br /> � F x <br /> . a". � ,. <br /> .. ...: _.,.,.�,�-,„,- .. 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